RaceQuip SFI 27.1 Rated Ribbon Window Nets are constructed of heavy-duty 1" polypropylene webbing and nylon thread for maximum durability. RaceQuip utilizes a jig-built construction technique to ensure consistent size, shape, and fit. This auto racing window net fits a window size of 18" High X 24" Wide which is standard and will fit most common racecar window openings. SFI 27.1 certified and available in black, red, blue, yellow, orange, purple, platinum, and green.